Stack and reach
How high and how far forward the top of the head tube is, from the bottom bracket. They are the two numbers that decide whether a frame can be set up like yours.
BB, or bottom bracket
The axle your cranks turn on, in the middle of the frame. Every number on this site is measured from it, because it is the one point that sits in the same place on every bike.
Headset cover
The little cap on top of the head tube, under your spacers. Most makers do not publish it, so I assume 15 mm and add 6 mm to the band, which on its own is enough to hold an answer at "probably" rather than "fits".
Stem clamp, and its centre
The collar on the steerer that your stem bolts to. I need the middle of it. Where a maker gives only the height, I assume halfway up and say so on the answer.
Steerer
The tube coming up out of the fork. The cover, the spacers and the stem all sit on it, and it is the thing a mechanic cuts to length.
Bar reach
How far forward the hoods sit from the middle of the bar. Two bars on the same stem can put your hands 20 mm apart, which is why I ask.
Setback
How far your saddle sits behind the bottom bracket.
Drop
How much lower your hands sit than your saddle. On a riser bar I count the bar's rise, so the drop is that much less than it is to the clamp.
Rails, and the rail centre
The two rods under your saddle, and the middle of the straight part of them. That midpoint is the point I use, because it is the one you can find with a tape.
The band
How far out I could be, in millimetres, and why. It is a straight sum of everything I had to assume rather than a clever average, so it errs wide on purpose.
wb, stand, trail
Wheelbase, standover and trail: how long the bike is, how high the top tube is where you straddle it, and how steady the steering feels. I show them against your bike, and I leave them out when the maker does not publish them.
est.
Estimated: a number I worked out rather than read off the maker's table. Anything marked this way can move if the maker publishes the real one.
Close Escape closes it. The measuring guide has the pictures. Open the measuring guide
Spcycle G028
Gravel · 4 sizes
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This is the bike I ride
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- Bike
- Spcycle G028 · Gravel · 4 sizes
- Geometry
- sp-cycle.com, fetched 21 Oct 2026, re-checked, no differences
- Cockpit
- Generic stem and bar, assumed
- Solved with
- cover 15 mm (assumed), max spacers 40 mm (assumed), stem clamp centre 20 mm (assumed), so every verdict carries ±10 mm at the bar
- Sheet
- 22 October 2026 · 686 bikes, 74 makes, 3,984 sizes in the catalogue
Geometry, every size, from the maker's table
The tinted row is the size drawn beside it. Press a size to draw it.The table runs on to the right: 6 more columns after Reach. Scroll it sideways to read them.
The L drawn to scale from the table, with no build on it. Stack and reach run from the bottom bracket to the top of the head tube; every size is solved from those two. One square is 100 mm.
The maker's cockpit
No stock cockpit I can name, so every size is solved on a generic stem and bar unless you choose one on the sheet.Spcycle HB-068Vendor-listedstem -6 · reach 69 · drop 116 · clamp 40 · lengths 60-120 · widths 380-460
Frame facts
read from the maker's words, not a table: sp-cycle.com- Tyre clearance
- not recorded yet
- Bottom bracket
- T47 85.5
- Axles and brakes
- flat mount
- UDH
- not recorded yet
- Seatpost
- 27.2 mm round
- Frame weight
- 1100 g
In the maker's words
Kept whole, as I read it off sp-cycle.com.Two-piece cockpit (the frameset is sold without a bar).
Cockpit and seatpost, in the maker's words · 19 words
Two-piece cockpit (the frameset is sold without a bar). Stock stem and bar per size are not published (null).
SOURCE: www.sp-cycle.com is Spcycle's own store (51microshop platform. Source: image_table (maker's own store, description image
How I read the maker's table
the brand also sells through an AliExpress store, which was not used). The geometry is an image in the product description on the maker's page; the page embeds that image from Alibaba's image CDN (ae01.alicdn.com or ae-pic-a1.aliexpress-media.com) or from the store's own image bucket, and it was fetched from the address the maker's page gives. Table columns keyed to the drawing (letters only): A seat tube, B top tube (drawn horizontal), C BB drop, D chainstay, E seat angle, F head angle, G front centre, H head tube, I fork offset, J fork length 405 every size (not in the schema), K wheelbase, L stack (drawn vertical), M reach (drawn horizontal); the letter meanings are my reading of the drawing. Parameter list image: Model SP-G028; T1000 + T1100; T47 85.5; tyres to 700 x 57C; frame 1100+/-60 g, fork 460+/-15 g; seatpost 27.2 mm; flat mount 160 mm rotor; sizes S/M/L/XL. A second listing sells it with the HB-068 handlebar (docs/research/cockpits/spcycle-hb-068.json). TOP TUBE FLAG: the S prints 533.6 where reach 385 plus stack 555 over tan 74 gives 544.1 (the M, L and XL close within 0.5 mm); kept as printed. Trail and standover are not published unless named. STACK DATUM: not stated; head tube top assumed. MODEL YEAR: 2026, from the listing title. No Panda Podium, Geometry Geeks or 99 Spokes request was made.
Source: image_table (maker's own store, description image https://usaimages.oss-us-west-1.aliyuncs.com/6230/product/detail/20260515/1778837727143_6.jpg, 1000x1504 JPEG, read by eye)
